Dobby for looms



May 10 1927. P. J. BANZET DOBBY FOR Looms Filed July 15, 1924 2 Sheets-Sheet 1 To SHUTTLE 50x53 I 71 v e ntar W ldbttzag- M Patented May 10, 1927.

nears stares PATENT OFFICE...

IAUL JOSEPH BANZET, F BQURGOIN, FRANCE, ASSIGNOB TO BRUYERE BANZET;& '00.,

SOGIETE DAUPHINOISE DE IEEATERIEL PORATION OF FRANCE.

TEXTILE, OF BOURGOIN', FRANCE, A COB- BOBBY FOR LOOMS.

Application filed July 15, 1924, Serial No.

The present invention relates to double lift dobbies and more particularly the dobby mechanisms of the class employed for the driving motions of boires for rising box weaving looms having a plurality of shuttles, more especially the positive drive motions for so called pick-pick looms; motions of the kind according to which one employs sleeves with toothed and plain sectors displaced and arranged in difi'erent planes, and which can, by longitudinal displacement of the sleeves, come into contact with the toothed and plain sectors of a rotary plate fixed on the lay shaft of the weaving loom.

Its object is to introduce improvements in this type of double lift .dobby, chiefly for the purpose of maintaining raised, during sev eral picks in succession, one or several treadles without perceptible displacement of these treadles between each pick and the next, which arrangement when used for the drive of positive movements for rising boxes of the kind indicated above permits keeping the sleeves with toothed and plain sectors at their extreme positions during all the time required, without producing accidental movements in each of the extreme positions and to prevent positive movements properly speaking, with all arrangements, or stopping means for these sleeves, so as to maintain them in their proper position during the work.

These improvements being the object of the invention are described hereinafter and represented in the drawing annexed to the present specification according to which,

Fig. 1 is a side elevation of an improved dobby mechanism,

Fig. 2 is a longitudinal section thereof on an enlarged scale, and

Fig. 3 is a similar view with a card reducing or saving motion.

According to these figures, and so far as concerns the usual device constituting this kind of double litt dobby, which is composed in the ordinary way of two lateral checks 1, connected by cross-pieces 2, the grates 3 and 4 and the box 5 for needles 6;

In the sockets '4' of the cheeks or walls 1 there oscillates the spindle 8 carrying keyed upon it the two swing baulks 9 intended to support the gritte bars 10 as well as the driving crank 11 driven by the connecting rod 12.

On the spindle 13 there are mounted the 726,080, and in France November 27, 1923. f

lifting-levers 14 of the mechanism, which have two arms 15 and 16, the arms 15 being connected to the rods 17 for positively driving the boxes whilst the arms 16 have double swing levers 19 mounted so as tooscillate on spindles 18, said levers having hooks 21 at the end thereof which are mounted so as to be articulated on pivots 20 and are intended or rocking levers) 22, oscillating on the axles 23, which act each on their respective upper hooks 21 through. the medium ot'the needles 2%, and on their lower hooks 21 by their bent ends 25.

The needles 6 of the needle box 5 act on the balance levers 22, actuated by the independent card cylinder 26. This cylinder and the set of needles 6 may be replaced by or combined with drawing devices 27' connected either with a 'do'bby or with a jacquard mechanism, the drive of cylinder 26 being assured by its being mounted between the ends of two levers 28 articulated at "29 on the checks 1, and on one'of whichis' mounted so as to be articulated, the connecting rod 30 5 a spring 31' fixed to the lever 28 acting on a hexagon 32 which is in one piece with the axis of the cylinder 26, limits its position at each oscillation; which causes it to revolve to the extent of one sixth of a revolution by means of the pawl 33 when the mechanism does not contain a card reducing motion.

Alternatively the card reducing motion may be arranged in thefollowing manner constituting in conjunction with the double lift dobby, of the type described above, one of the improvements forming the object ot the invention. V

For this purpose, on'the outside of one of the cheeks 1 of the dobby mechanism, hence at the end of the needle box 5, a supplementary needle 6, analogous to the needles 6 is mounted, being driven by a supplementary hole in the card. 'This needle 6 acts on'a balance lever 3:4,oscillating 'on'the azzle'23 of the balance levers 22 an'dhaving on its iii on a ratchet wheel 36 mounted loose on the same axle 23. The stroke of the said balance lever 3st is regulated by an abutment screw 37 while a spring 38 tends to make the balance lever bear continually against the needle 6 driven by the cylinder.

(in the same axles 23 of these devices and rigidly partaking in the revolution of the.

ratchet wheel 36, a disc 39 is mounted which carries on its periphery one or more notches the number of which as well as of the teeth of the ratchet 34 are selected according to the set 01 wetts to be executed, necessitating the maintenance at work of the same card for a certain stated number of picks. one of the checks 1 of the dobby, there scillates another balance lever d2 of which one end in the form of tooth 13 penetrates into one or tie notches of the disc 39-.

a spring arranged on the. axle ail of balance lever 42, or otherwise, tending to make.

the tooth 43 bear constantly against the periphery of disc 39-the opposite end of this same balance lever 12. carrying an adjustable.

u: which is thus removed fromi the cylinder 26 of which the partial revolution of one sixth of a whole revolution at the time of the oscillations of system 28, operated by the rod 30, is suspended until the arrival of a notch 10 of the disc 39 carried forward by the ratchetwheel 36. Lastly in the improved dobby mechanism of the kind described above, a 'lurtherimprove ment consists in the arrangement for thedrive of the crank 11 of the swing baulks 9 with gritie bars 10 by the connecting rod 12 and card cylinder 26 with its oscillatine; system 23 by the rod 30.

This arrangement actuating the connecting rods 12 and 30, consists in mounting the end of the connecting rod 12, in an articulated way on the crankpin. ot a wheel 46. with toothed sections 17 and con- 0 ve plain sections 18 for a state of rest which wheel is mounted loose on a, shaft 49 rigidly connected to a support 50 fixed on one of the side frame pieces 51 of the loom, this wheel 46 receiving an intermittent rotary movement by means of a pinion with interrupted series of teeth 52, the untoothed periphery 53 of which forms a plain convex sector and is separated from the toothed. portion by two notches 54L permitting the passage 01": the corners of the con- On an axle ll rigidly attached to cave sectors 48 of the wheel t6the said pinion 52 53 being keyed on the. shaft 55 of the loom (when the mechanism is placed on the same side as the rising box motion which it operates and 01 which the rotary plate is already keyed upon the lay shaft or else when two rising boxmotions are arranged on each side of the lay of the loom) or keyed on the lay shaft (when the dobloy mechanism is placed on. the side opposite to that of the rising box motion which it operates or when a dobby mechanism improved as above is working in the usual manner, is in question).

As regards the drive of the cylinder 26,

by the connecting rod 30, the latter is mounted at its end in a socket 56 made in one piece with a strap 57 of an eccentric 58 keyed to the shaft 55 or to the lay shat't as the case may be.

Thus improved, this dobby mechanism works in the following manner: Supposing that one of the balance levers 22 oscillates under the action of the cylinder 26 or that a jacquard or other mechanism, it. allows the two hooks 21 to go down through the medium of its needle 24:- and; its bent end 25. At this moment the two gritle bars 10 are each in one of their extreme positions, one of the two books 21 being therefor engaged with one of the griile bars.

hen the oscillation of thekniveslO commencesin consequence of the action of the swing baulks 9 operated by, the crank 11, the connecting rod 12 and the intermittent device 416, 48, 52, 53. the hook 21, which is engaged, will be carried along and will cause the balance lever 19 to oscillate round the axis of articulation 20 of the hook 21, which is not engaged; which oscillation of the balance lever 19 causes raising. of the corresponding lifting lever 1 1- which by means of the rod 17 which is attached to it, will operate the control lever of the rising boX- motion. -t the shuttle; boxes are not to change their position during a certain nun1- ber of picks, the balance beam 22. of the mechanism willremain in, an inclined position in the following shoot or pick, the gritl'e bars 10 change their extreme position and the hook 21, which had. not been engaged at the. first pick will come into. engagen'ient with the other grifle bars 10. While this second hook 21 is drawn. the first hook which was engaged will be brought back to its original position. but as the centre of articulation 18 ot the. balance lever 19 does not perceptibly change its place, the lifting. lever 14 which is already raised will remain in this same position, and so on until the boxes have to return or change position.

At this moment the jacquard mechanism drawing on the rod 27 will cause the balance lever 22 to oscillate and be again lowered,

or the hook 33 brought again into contact with the cylinder 26 by the action of the card reducing device, (of which the working has been rendered sufiiciently comprehensible at the time of its description) will operate the said cylinder at the moment of the oscillation of its articulated support 28, operated by the connecting rod 30 and the eccentric 57-58.

It is understood that the number of sets of hooks 21 and lifting levers 14, worked by the said sets will correspond to the number of rods 17 to be operated and which for instance for the drive of a single or double rising box motion on one side only of the lay or two single rising box motions on each side of the lay one or two lifting levers 14 will be used, three or four levers being necessary for operating one double rising box motion and one single 'ising box motion on each side of the lay for two double rising box motions on each side.

In this case one will utilize the arrangement which consists in connecting, by small connecting rods 59, the lifting levers 14 intended to operate the rods 17 of the rising box motions situated on the side opposite to that of the dobby mechanism, by levers 60 mounted on a support 61, fixed on the side frame 51, and keyed to the end of rods 62 running along the loom, and the opposite ends of which supported by a support simi lar to that 61, receive keyed to them levers similar to those 60 and to which the control rods 17 of the aforesaid movements are attached.

l/Vhat I claim is:

1. In a double lift dobby mechanism having multiple shuttles and rising box mechanisms for the control thereof, with swinging baulks and griffe bars, the actuating means therefor comprising in combination an intermittent device, comprising a gear attached to loom shaft, having toothed sectors and plain sectors and a cooperating gear having toothed sectors cooperating with the toothed sectors of said gear, and concave sectors cooperating with said plain sectors, a crank pin attached to said second mentioned gear, and a connecting rod leading therefrom to means cooperating with said griffe bars, whereby a dwell is obtained at the end of each movement of said griife bars.

2. In a double lift dobby mechanism having multiple shuttles and rising boX mechanisms for the control thereof, with swinging baulks and griffe bars, the actuating means therefor comprising in combination, an intermittent device, comprising a gear attached to a loom shaft, having toothed sectors and plain sectors and a cooperating gear having toothed sectors cooperating with the toothed sectors of said gear, and concave sectors cooperating with said plain sectors, a crank pin attached to said second mentioned gear, and a connecting rod leading therefrom to means cooperating with said griffe bars, whereby a dwell is obtained at the end of each movement of said griffe bars, hook and link mechanisms cooperating with said griffe bars for the actuation of said shuttle boxes, means controlling said hoolrs comprising a swinging card cylinder and means for actuating said card cylinder comprising a crank and connecting rod attached to the same shaft as said first mentioned sector gear.

3. In a double lift dobby mechanism having multiple shuttles and rising box 1nechanisms for the control thereof, with swinging baulks and gritfe bars, the actuating means therefor comprising in combination, an intermittent device, comprising a gear at tached to a loom shaft, having toothed sectors and plain sectors and a cooperating gear having toothed sectors cooperating with the toothed sectors of said gear and concave sectors cooperating with said plain sectors, a crank pin attached to said second mentioned gear, and a connecting rod leading therefrom to meanscooperating with said griffe bars whereby a dwell is obtained at the end ofeach movement of said griife bars, hook and link mechanisms cooperating with said griife bars for the actuation of said shuttle boxes, means controlling said hooks comprising a swinging card cylinder, means for actuating said card cylinder comprising a crank and connecting rod attached to the same shaft as said first mentioned sector gear, and means for intermittently actuating said card cylinder comprising a ratchet wheel, and ratchet lever, means for actuating said ratchet lever from said card cylinder gear, an auxiliary wheel attached to said ratchet wheel and having notches therein, a cam lever adapted to engage with said notches, and a swinging ratchet adapted to engage with said card cylinder for the rotation thereof, and means comprising a stop cooperating with said cam lever for disengaging said ratchet lever when said cam lever leaves said notches.

In testimony whereof I aflix my signature.

PAUL JOSEPH BAN ZET. 

